Process Manager Interface Narayan Desai, Rusty Lusk, Rick Bradshaw.

Process Manager Interface

Narayan Desai, Rusty Lusk, Rick Bradshaw

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Outline

• PM Functionality

• PM Syntax

• PM Commands

• PM Datatypes

• PM Events

• PM Examples

• PM BNF

• PM Schema

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Process Manager Functionality

• Starts process groups, with specification of environments of application processes, either collectively or on a process-by-process basis– Executable– Arguments– Environment variables– User– Resource limits– Hosts for each process– Working directory

• Queries the state of a running process group, returning some startup parameters

• Delivers signals to all processes in a process group• Terminates a process group• After process group exit, can wait on the group to collect exit

codes and output.

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Process Manager Syntax

• The Process Manager uses the “less restricted syntax” style presented elsewhere

• Each message to it does three things:1. Describes a process group specification

to be matched or created

2. Conveys a command, with arguments

3. Specifies an object to be returned

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Process Manager Commands

• CreateProcessGroup– Takes as input a ProcessGroupSpecification object– Returns a PGID

• GetProcessGroup– Takes as input a ProcessGroup object which is matched against– Returns a ProcessGroups container object containing requested

fields from matched process group instances

• SignalProcessGroup– Takes as input a Process Group object which is matched against– Takes as argument a signal name and the scope of the signal

(top-level processes or also forkees)– Returns requested fields from the process groups signaled

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Process Manager Commands (cont.)

• KillProcessGroup– Terminates matching process groups

• Best effort to really kill processes, which may require repeated signalling

– Returns the process groups matched

• WaitProcessGroup– Returns exit code information and stream

output from matching completed process groups

– Purges such information from the Process Manager state

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Process Manager Datatypes

• ProcessGroupSpecification– Used as input to CreateProcessGroup

• ProcessGroup– Used as matching description and returned

description in other commands

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Process Manager Events

• Generated when a process group is successfully started:

<Event>  <Component>process-manager</Component>  <Message>ProcessStart</Message>  <Data>29</Data> </Event>

• Generated when a process group terminates:

<Event>  <Component>process-manager</Component>  <Message>ProcessEnd</Message>  <Data>29</Data> </Event>

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Process Manager Examples - 1

<CreateProcessGroup>  <ProcessGroupSpecification>     <User>desai</User>     <Size>8</Size>     <Executable>/bin/false</Executable>     <CWD>/tmp</CWD>     <Diversions>       <Diversion>          <Range>6-7</Range>          <Executable>/bin/true</Executable>          <Environment>            <Variable>              <Name>LD_LIBRARY_PATH</Name>              <Value>/local/lib</Value>            </Variable>          </Environment>          <Arguments>

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Process Manager Examples - 2

             <Argument>-v</Argument>          </Arguments>      </Diversion>    </Diversions>    <HostSpecification>      <Mode>Unordered</Mode>      <Value>ccn1                    ccn2                    ccn3                    ccn4                    ccn5                    ccn6                    ccn7                    ccn8       </Value>    </HostSpecification>  </ProcessGroupSpecification></CreateProcessGroup>

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Process Manager Examples - 3

<GetProcessGroup>  <ProcessGroup>    <PGID>29</PGID>    <Processes>      <Process>         <Host match='false'/>      </Process>    </Processes>  </ProcessGroup></GetProcessGroup>

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Process Manager Examples - 4ProcessGroups>  <ProcessGroup>     <PGID>29</PGID>     <Processes>        <Process>           <Host>ccn1</Host>        </Process>        <Process>           <Host>ccn2</Host>        </Process>        <Process>           <Host>ccn3</Host>        </Process>        <Process>           <Host>ccn4</Host>        </Process>        <Process>           <Host>ccn5</Host>        </Process>        <Process>           <Host>ccn6</Host>        </Process>        <Process>           <Host>ccn7</Host>        </Process>        <Process>           <Host>ccn8</Host>        </Process>     </Processes>  </ProcessGroup></ProcessGroups>

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Process Manager Examples - 5

<GetProcessGroup>

  <ProcessGroup>

     <PGID>29</PGID>

     <Status match='false'/>

  </ProcessGroup>

</GetProcessGroup>

<ProcessGroups>

  <ProcessGroup>

     <PGID>29</PGID>

     <Status>Finished</Status>

  </ProcessGroup>

</ProcessGroups>

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Process Manager Examples - 6

<WaitProcessGroup>  <ProcessGroup>     <PGID>29</PGID>     <ExitStatus>       <Status>           <Code negate='true'>0</Code>           <Host match='false'/>       </Status>     </ExitStatus>     <Output>       <Stream>          <Name op='re'> stdout | stderr </name>          <Value match='false'/>       </Stream>     </Output>   </ProcessGroup></WaitProcessGroup>

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Process Manager Examples - 7

<ProcessGroups>  <ProcessGroup>    <PGID>29</PGID>    <ExitStatus>      <Status>        <Host>ccn2</Host>        <Code>1</Code</Host>      </Status>      <Status>        <Host>ccn6</Host>        <Code>255</Code>      </Status>   </ExitStatus>   <Output>      <Stream>        <Name>stdout</Name>

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Process Manager Examples - 8

        <Value>process 0 on ccn1process 1 on ccn2process 2 on ccn3process 3 on ccn4process 4 on ccn5process 5 on ccn6process 6 on ccn7process 7 on ccn8</Value>      </Stream>      <Stream>        <Name>stderr</Name>        <Value/>      </Stream>    </Output>  </ProcessGroup></ProcessGroups>

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Process Manager BNF - 1

[InMsg] ::= [CreateCommand] | [Query][CreateCommand] ::= <CreateProcessGroup> [PGSpecification]                                     </CreateProcessGroup>[PGSpecification] ::= <ProcessGroupSpecification> [PGSattrs]                                   </ProcessGroupSpecification>[PGSattrs] ::= [PGSattr] | [PGSattr] [PGSattrs][PGSattr] ::= <[FieldName]>[FieldValue]</[FieldName]>[Query] ::= <[ArgCmd] [Arguments]> [ProcessGroup] </[ArgCmd]> |                  <[Command]> [ProcessGroup] </[Command]>[Command] ::= KillProcessGroup | GetProcessGroup | WaitProcessGroup[ArgCmd] ::= SignalProcessGroup[Arguments] ::= [] | [Argument] | [Argument] [Arguments][Argument] ::= [identifier]=[identifier][ProcessGroup] ::= <ProcessGroup> [Fields] </ProcessGroup>[Fields] ::= [Field] | [Field] [Fields]|                  [MultiField] | [MultiField] [Fields]

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Process Manager BNF - 2

[Field] ::= <[FieldName]> [FieldValue] </[FieldName]>[FieldName] ::= PGID|User|Size|Executable[FieldValue] ::= identifier[MultiField] ::= <[FieldGroup]> [MFields] </[FieldGroup]>[MFields] ::= [MField] | [MField] [MFields][MField] ::= <[MFName] [Qualifiers]>[MFValue]</[MFName]>[Qualifiers] ::= [] | [Qualifier] [Qualifiers][Qualifier] ::= [BooleanKey]=[BooleanValue]|                       [StringKey]=[StringValue][BooleanKey] ::= 'negate' | 'match' | 'return'[BooleanValue] ::= 'true' | 'false'[StringKey] ::= 'op'[StringValue] ::= 'eq' | 'ne' | 'lt' | 'gt' | 'le' | 'ge' | 'range' | 're'[MFName] ::= HostSpec | Environment | Diversions[MFValue] :: identifier

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Process Manager Schema - 1<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xml:lang="en">  <xsd:annotation>    <xsd:documentation>      Process Manager component schema      SciDAC SSS project, 2004       Andrew Lusk [email protected]      Narayan Desai [email protected]    </xsd:documentation>  </xsd:annotation>

<xsd:simpleType name='BooleanType'>    <xsd:restriction base='xsd:string'>      <xsd:pattern value='true|false'/>    </xsd:restriction>  </xsd:simpleType>

<xsd:simpleType name='IntegerOps'>    <xsd:restriction base='xsd:string'>      <xsd:pattern value='eq|lt|gt|range|re'/>    </xsd:restriction>  </xsd:simpleType>

<xsd:simpleType name='StringOps'>    <xsd:restriction base='xsd:string'>      <xsd:pattern value='eq|re'/>

    </xsd:restriction>

  </xsd:simpleType>

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Process Manager Schema - 2 <xsd:simpleType name='Signals'>

    <xsd:restriction base='xsd:string'>

      <xsd:pattern

      value='ABRT|ALRM|BUS|CHLD|CLD|CONT|FPE|HUP|ILL|INT|IO|IOT|KILL|PIPE|POLL|PROF|PWR|QUIT|SEGV|STOP|SYS|TERM|TRAP|TSTP|TTIN|TTOU|URG|USR1|USR2|VTALRM|WINCH|XCPU|XFSZ'/>

    </xsd:restriction>

  </xsd:simpleType>

<xsd:attributeGroup name='BaseLRSQuery'>

    <xsd:attribute name='match' type='BooleanType'/>

    <xsd:attribute name='negate' type='BooleanType'/>

    <xsd:attribute name='return' type='BooleanType'/>

  </xsd:attributeGroup>

<xsd:complexType name='IntegerQueryAttribute'>

    <xsd:simpleContent>

      <xsd:extension base='xsd:integer'>

        <xsd:attributeGroup ref='BaseLRSQuery'/>

        <xsd:attribute name='op' type='IntegerOps'/>

      </xsd:extension>

    </xsd:simpleContent>

  </xsd:complexType>

<xsd:complexType name='StringQueryAttribute'>

    <xsd:simpleContent>

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Process Manager Schema - 3      <xsd:extension base='xsd:string'>        <xsd:attributeGroup ref='BaseLRSQuery'/>        <xsd:attribute name='op' type='IntegerOps'/>      </xsd:extension>    </xsd:simpleContent>  </xsd:complexType>

<xsd:complexType name='ProcessQueryType'>    <xsd:sequence>      <xsd:element name='Host' type='StringQueryAttribute' minOccurs='0'/>      <xsd:element name='PID' type='StringQueryAttribute' minOccurs='0'/>      <xsd:element name='Session' type='StringQueryAttribute' minOccurs='0'/>    </xsd:sequence>  </xsd:complexType>

<xsd:complexType name='ProcessSet'>    <xsd:choice minOccurs='1'>      <xsd:element name='Process' type='ProcessQueryType'/>    </xsd:choice>  </xsd:complexType>    <xsd:complexType name='ProcessGroupQuery'>    <xsd:sequence>      <xsd:element name='PGID' type='IntegerQueryAttribute' minOccurs='0'/>

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Process Manager Schema - 4      <xsd:element name='Size' type='IntegerQueryAttribute' minOccurs='0'/>      <xsd:element name='User' type='StringQueryAttribute' minOccurs='0'/>      <xsd:element name='Status' type='StringQueryAttribute' minOccurs='0'/>      <xsd:element name='Processes' type='ProcessSet' minOccurs='0'/>    </xsd:sequence>  </xsd:complexType>

<xsd:complexType name='PGQuery'>    <xsd:choice minOccurs='1' maxOccurs='unbounded'>      <xsd:element name='ProcessGroup' type='ProcessGroupQuery'/>    </xsd:choice>  </xsd:complexType>

<xsd:element name='GetProcessGroup' type='PGQuery'/>  <xsd:element name='KillProcessGroup' type='PGQuery'/>  <xsd:element name='WaitProcessGroup' type='PGQuery'/>

<xsd:element name='SignalProcessGroup'>    <xsd:complexType>      <xsd:choice minOccurs='1' maxOccurs='unbounded'>        <xsd:element name='ProcessGroup' type='ProcessGroupQuery'/>      </xsd:choice>      <xsd:attribute name='signal' type='Signals' use='required'/>    </xsd:complexType>  </xsd:element>

</xsd:schema>

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Notes